Mixed Results at Statoil's Dagny Prospect
Statoil, operator of production license 303, is in the process of completing the drilling of wildcat well 15/6-11 S and appraisal well 15/6-11 A on the gas/condensate/oil discovery 15/5-1 Dagny.
The Dagny discovery was proven in the 1970s in Middle Jurassic reservoir rocks just north of the Sleipner Vest field. The discovery was further delineated in 2007 by the appraisal well 15/6-9 S on the Ermintrude structure.
Before the last wells were drilled, the resource estimate for Dagny was between 15 and 50 million standard cubic meters (Sm3) of recoverable oil equivalents. The wells were drilled approx. four and two kilometers south-east of the discovery well 15/5-1 Dagny.
The purpose of the wells was to prove, delineate and test the production properties of the oil zone in Middle Jurassic reservoir rocks (the Hugin formation) between Dagny and Ermintrude. Wildcat well 15/6-11 S, which was drilled to the deepest point of the structure, encountered only non-mobile petroleum in the Hugin formation with varying reservoir quality. Appraisal well 15/6-11 A, which was drilled to a shallower point of the structure, encountered a gas column of 30 meters in the Hugin formation in reservoir rocks with quality corresponding to that of 15/5-11 S.
Comprehensive data acquisition and sampling have been carried out. A successful formation test was conducted. The maximum production rate was 225 000 Sm3 gas and 120 Sm3 condensate respectively per flow day through a ½-inch nozzle opening. The extent of the Dagny discovery is currently estimated at between 20 and 40 million Sm3 recoverable oil equivalents. The licensees are considering various concepts for the Dagny discovery and how the information from the latest wells will affect their choice of concept and schedule.
The wells were drilled on behalf of production licenses 048, 303, 029 and 029 B. These are the fifth and sixth exploration wells in production license 303, which was awarded on December 12, 2003 (APA 2003). 15/6-11 S and 15/6-11 A were drilled to vertical depths of 4099 and 3830 meters below sea level, respectively, and were both terminated in the Skagerrak formation in the Upper Triassic. The wells are/will be permanently plugged and abandoned.
Wells 15/6-11 S and 15/6-11 A were drilled in 116 meters of water using the drilling facility Ocean Vanguard, which is now headed for production license 272 in the northern part of the North Sea to drill wildcat well 30/11-8, where Statoil Petroleum AS is the operator.
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